<template>
  <el-container class="home-container">
    <!-- 头部区 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="">
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px' ">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区 -->
        <el-menu
              background-color="#333744"
              text-color="#fff"
              active-text-color="#409EFF"
              unique-opened
              :collapse="isCollapse"
              :collapse-transition="false"
              router
              :default-active="activePath"
              >
              <!-- 一级菜单 -->
              <el-submenu :index="item.id +''" v-for="item in menulist" :key="item.id" >
              <!-- 一级菜单的模板区 -->
                <template slot="title">
                  <!-- 图标 -->
                  <i :class="iconObj[item.id]"></i>
                  <!-- 文本 -->
                  <span>{{item.authName}}</span>
                </template>
                <!-- 二级菜单 -->
                <el-menu-item :index=" '/'+ subItem.path" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/' + subItem.path)">
                  <template slot="title">
                    <!-- 图标 -->
                    <i class="el-icon-menu"></i>
                    <!-- 文本 -->
                    <span>{{subItem.authName}}</span>
                  </template>
                </el-menu-item>
              </el-submenu>
            </el-menu>
      </el-aside>
      <!-- 右侧内容布局 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>

</template>

<script>
  export default {
    data(){
      return {
        // 左侧菜单数据
        menulist:[],
        iconObj:{
         '125': 'iconfont icon-user',
         '103': 'iconfont icon-tijikongjian',
         '101': 'iconfont icon-shangpin',
         '102': 'iconfont icon-danju',
         '145': 'iconfont icon-baobiao'
        },
        // 是否折叠
        isCollapse: false,
        // 被激活的链接地址
        activePath:'',
      }
    },
    created() {
      this.getMenuList()
      this.activePath = window.sessionStorage.getItem('activePath')
    },
    methods: {
      logout() {
        window.sessionStorage.clear()
        toggleCollapse
        this.$router.push('/login')
      },
      // 获取所有的菜单
      async getMenuList() {
       const { data: res } = await this.$http.get('menus')
       if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
       this.menulist = res.data
       console.log(res)
     },
     // 点击按钮，切换菜单的折叠与展开
     toggleCollapse() {
       this.isCollapse = !this.isCollapse
     },
     // 保存链接的激活状态
     saveNavState(activePath){
      window.sessionStorage.setItem('activePath',activePath)
      this.activePath = activePath
     },
    }
  }
</script>

<style lang="less" scoped>
  .home-container {
    height: 100%;
  }
  .el-header {
    background-color: #373d41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    color: #fff;
    font-size: 20px;
    > div{
      display: flex;
      align-items: center;
      span{
        margin-left: 15px;
      }
    }
  }

  .el-aside {
    background-color: #333744;
    .el-menu{
       border-right: none;
    }
   }

 .el-main {
  background-color: #eaedf1;
}

.iconfont{
  margin-right: 10px;
}
.toggle-button {
  background-color: #4a5064;
  color: #fff;
  font-size: 10px;
  line-height: 24px;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>
